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Troubleshooting
Manual
TM
‐
12
‐
011
5
1.4 “E4” Compressor overload / Indoor coil sensor short / Outdoor coil sensor
short
Wired
Controller
Display
E4
LED
indications
Error
Generation
The
error
is
generated
when
outdoor
coil
sensor
>
68
˚
C
in
cooling
or
indoor
coil
sensor
>
68
˚
C
in
heating;
indoor
coil
sensor
is
shorted;
outdoor
coil
sensor
is
shorted.
Supposed
causes
The
possible
causes
are:
Compressor
high
current
Faulty
indoor
coil
sensor
Faulty
outdoor
coil
sensor
Troubleshooting